Update changelog.

CHANGELOG.md

@@ -20,6 +20,7 @@ Copy and pasting the git commit messages is __NOT__ enough.
 ### Deprecated
 - Module `smarts.core.models` is now deprecated in favour of `smarts.assets`.
 ### Fixed
+- Fixed a bug where `smarts.core.vehicle_index.VehicleIndex.attach_sensors_to_vehicle()` would pass a method instead of a `PlanFrame` to the generated vehicle `SensorState`.
 - Fixed an issue where `AgentInterface.vehicle_type` would not affect agent vehicles when attempting to take over an existing vehicle.
 - Fixed a case where newly created agent vehicles would have a constant `"sedan"` size instead of the size of `AgentInterface.vehicle_type`.
 - Fixed a case where if vehicles are replaced they would not respect controller and vehicle parameters.